Merge pull request #95 from ShaikDawood/gh-pages

updating challenges and registration.html pages
Merge pull request #27 from SMU-SIS/gh-pages

update
fixed for the auto advance and video pop up close when encounter unplayable video
Merge pull request #96 from LI-HE/gh-pages

fixed for the auto advance and video pop up close when encounter unplayable video
Merge pull request #20 from SMU-SIS/gh-pages

update
resolve resume to normal play page issue
Merge pull request #97 from ruijunhuang2010/gh-pages

resolve resume to normal play page issue
Show program solved status
Merge pull request #98 from ruijunhuang2010/gh-pages

show problem solved status
Merge pull request #21 from SMU-SIS/gh-pages

updating my repo..